[Qemu-devel] [PATCH 0] A series patches for kvm&qemu to enable vcpu destruction in kvm

[Liu Ping Fan]

A series of patches from kvm, qemu to guest. These patches will finally enable 
vcpu destruction in kvm instance and let vcpu thread exit in qemu.
 
Currently, the vcpu online feature enables the dynamical creation of vcpu and 
vcpu thread, while the offline feature can not destruct the vcpu and let vcpu 
thread exit, it just halt in kvm. Because currently, the vcpu will only be 
destructed when kvm instance is destroyed. We can 
change vcpu as an refer of kvm instance, and then vcpu's destruction MUST and 
CAN come before kvm's destruction.

These patches use guest driver to notify the CPU_DEAD event to qemu, and later 
qemu asks kvm to release the dead vcpu and finally exit the 
thread. 
The usage is: 
        qemu$cpu_set n online
        qemu$cpu_set n zap   ------------ This will destroy the vcpu-n in kvm 
and let vcpu thread exit
     OR 
        qemu$cpu_set n offline  --------- This will just block vcpu-n in kvm

Any comment and suggestion are welcome.


Patches include:
|-- guest
|   `-- 0001-virtio-add-a-pci-driver-to-notify-host-the-CPU_DEAD-.patch
|-- kvm
|   |-- 0001-kvm-make-vcpu-life-cycle-separated-from-kvm-instance.patch
|   `-- 0002-kvm-exit-to-userspace-with-reason-KVM_EXIT_VCPU_DEAD.patch
`-- qemu
    |-- 0001-Add-cpu_phyid_to_cpu-to-map-cpu-phyid-to-CPUState.patch
    |-- 0002-Add-cpu_free-to-support-arch-related-CPUState-releas.patch
    |-- 0003-Introduce-a-pci-device-cpustate-to-get-CPU_DEAD-even.patch
    |-- 0004-Release-vcpu-and-finally-exit-vcpu-thread-safely.patch
    `-- 0005-tmp-patches-for-linux-header-files.patch